Binding at and transactivation of the COX-2 promoter by nuclear tyrosine kinase receptor ErbB-2

  • Chen I
  • Hung M
  • Lee D
  • et al.
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Abstract

Pathological expression of human ErbB-2 protein, also known as HER-2, is common in many types of cancer. ErbB-2 is a member of the EGF receptor tyrosine kinase family and has been rigorously studied as a signaling molecule on the cell membrane. Here, we report that ErbB-2 is also expressed in the nucleus in cultured cells as well as primary tumor tissues. Nuclear ErbB-2 was found to associate with multiple genomic targets in vivo, including the cyclooxygenase enzyme COX-2 gene promoter. ErbB-2 forms a complex at a specific nucleotide sequence of the COX-2 promoter and is able to stimulate its transcription. This study demonstrates the presence of ErbB-2 in the nucleus and identifies the function of ErbB-2 as a transcriptional regulator.

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Chen, I.-F., Hung, M.-C., Lee, D.-F., Lo, H.-W., Lien, H.-C., Wang, S.-C., … Wang, Z. (2004). Binding at and transactivation of the COX-2 promoter by nuclear tyrosine kinase receptor ErbB-2. Cancer Cell, 6(3), 251–261. https://doi.org/10.1016/j.ccr.2004.07.012

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